Metal Complexes with Macrocyclic Ligands. Part XLII. Tetraazamacrocyclic nickel(II) complexes with a methylthio or a methoxy pendant chain as model for cofactor F430
作者:Claudio L. Schmid、Christian Kempf、Andreas Taubert、Markus Neuburger、Margareta Zehnder、Thomas A. Kaden、Krzysztof Bujno、Renata Bilewicz
DOI:10.1002/hlca.19960790410
日期:1996.6.26
14-membered macrocyclic Ni2+ complexes of 1 and 2, with a methylthio pendant chain, and those of 3 and 4, with a methoxy pendant chain, have been synthesized and their chemistry has been studied. Solution spectra in H2O, MeCN, and DMF indicate no participation of the side-chain donor group in metal coordination. This is also the case in the solid state as shown by the X-ray structures of the Ni2+ complexes
合成了具有甲硫基侧链的1和2的14元大环Ni 2+配合物,以及具有甲氧基侧链的3和4的14元大环Ni 2+配合物,并对其化学进行了研究。H 2 O,MeCN和DMF中的溶液光谱表明,侧链供体基团没有参与金属配位。如具有1和2的Ni 2+配合物的X射线结构所示,固态也是如此,其中Ni 2+周围呈四面体扭曲的方平面几何形状通过大环的四个N原子的配合得到结果。MeCN中这些络合物的循环伏安法显示,相对于SCE ,Ni 2+在-0.7至-0.8 V之间可逆地还原为Ni +。对于具有1和2的配合物,硫醚键在更多的负电势下裂解,从而形成硫醇基。然后该硫醇基团在约200℃被氧化。+0.7 V vs. SCE,当使用玻璃状C电极时,或在。在下降的Hg电极上为0 V vs. SCE。3和4配合物中的醚键不断裂在类似条件下观察到。在DMF中用Na-汞齐还原1和2的Ni 2+络合物仅在1的情况下会产生少量甲烷,这表明Ni